Monitoring Flooding Water level on Lan-Yang River by Using Reflected GPS observations during storm weather of typhoon SEPTA, 2007/08/18

In this paper, the application and development of a highly integrated GPS receiver that employs reflected GPS signals for ground object detection and flood flow is described. Both righthand circular polarization (RHCP) and left-hand circular polarization (LHCP) antennas are employed so that the direct and reflected signals can be simultaneously obtained. The objective of this study is to use the carrier phase and the compensation of ionospheric delay & tropospheric delay of the reflected and direct signals for the floodwater, surface soil moistures of riverbeds. During the development and test stage, the satellite’s image, Precipitation and IR image of typhoon SEPTA are used and mapped with integrated software. The moving surface of floodwater at each instant is reflected by the carrier phase of the GPS signal reflected and the reflection point at that instant. With regard to the monitoring and forecasting of coastal flood tide height, floodplain, and floodwater levels, the reflection heights are accurate to within 30 cm